diff --git a/src/modules/networkcfg/main.py b/src/modules/networkcfg/main.py
index 35bf67d63..4dc6cbbf7 100644
--- a/src/modules/networkcfg/main.py
+++ b/src/modules/networkcfg/main.py
@@ -29,23 +29,83 @@ def pretty_name():
     return _("Saving network configuration.")
 
 
+def get_live_user():
+    """
+    Gets the "live user" login. This might be "live", or "nitrux",
+    or something similar: it is the login name used *right now*,
+    and network configurations saved for that user, should be applied
+    also for the installed user (which probably has a different name).
+    """
+    # getlogin() is a thin-wrapper, and depends on getlogin(3),
+    # which reads utmp -- and utmp isn't always set up right.
+    try:
+        return os.getlogin()
+    except OSError:
+        pass
+    # getpass will return the **current** user, which is generally root.
+    # That isn't very useful, because the network settings have been
+    # made outside of Calamares-running-as-root, as a different user.
+    #
+    # If Calamares is running as non-root, though, this is fine.
+    import getpass
+    name = getpass.getuser()
+    if name != "root":
+        return name
+
+    # TODO: other mechanisms, e.g. guessing that "live" is the name
+    # TODO: support a what-is-the-live-user setting
+    return None
+
+
+def replace_username(nm_config_filename, live_user, target_user):
+    """
+    If @p live_user isn't None, then go through the given
+    file and replace @p live_user by the @p target_user.
+
+    Reads the file, then (re-)writes it with new permissions lives.
+    """
+    # FIXME: Perhaps if live_user is None, we should just replace **all**
+    #        permissions lines? After all, this is supposed to be a live
+    #        system so **whatever** NM networks are configured, should be
+    #        available to the new user.
+    if live_user is None:
+        return
+    if not os.path.exists(nm_config_filename):
+        return
+
+    with open(target_network, "r") as network_conf:
+        text = network_conf.readlines()
+
+    live_permissions = 'permissions=user:{}:;'.format(live_user)
+    target_permissions = 'permissions=user:{}:;\n'.format(user)
+    with open(target_network, "w") as network_conf:
+        for line in text:
+            if live_permissions in line:
+                line = target_permissions
+            network_conf.write(line)
+
+
+def path_pair(root_mount_point, relative_path):
+    """
+    Returns /relative_path and the relative path in the target system.
+    """
+    return ("/" + relative_path, os.path.join(root_mount_point, relative_path))
+
+
 def run():
     """
     Setup network configuration
     """
     root_mount_point = libcalamares.globalstorage.value("rootMountPoint")
     user = libcalamares.globalstorage.value("username")
-    live_user = os.getlogin()
+    live_user = get_live_user()
 
     if root_mount_point is None:
         libcalamares.utils.warning("rootMountPoint is empty, {!s}".format(root_mount_point))
         return (_("Configuration Error"),
                 _("No root mount point is given for <pre>{!s}</pre> to use." ).format("networkcfg"))
 
-    source_nm = "/etc/NetworkManager/system-connections/"
-    target_nm = os.path.join(
-        root_mount_point, "etc/NetworkManager/system-connections/"
-        )
+    source_nm, target_nm = path_pair(root_mount_point, "etc/NetworkManager/system-connections/")
 
     # Sanity checks.  We don't want to do anything if a network
     # configuration already exists on the target
@@ -63,27 +123,16 @@ def run():
 
             try:
                 shutil.copy(source_network, target_network, follow_symlinks=False)
-                if live_user in open(target_network).read():
-                    text = []
-                    with open(target_network, "r") as network_conf:
-                        text = network_conf.readlines()
-                        with open(target_network, "w") as network_conf:
-                            for line in text:
-                                if 'permissions=user:{}:;'.format(live_user) in line:
-                                    line = 'permissions=user:{}:;\n'.format(user)
-                                network_conf.write(line)
-                    network_conf.close()
+                replace_username(target_network, live_user, user)
             except FileNotFoundError:
                 libcalamares.utils.debug(
-                    "Can't copy network configuration files in "
-                    + "{}".format(source_network)
+                    "Can't copy network configuration files in {}".format(source_network)
                     )
             except FileExistsError:
                 pass
 
     # We need to overwrite the default resolv.conf in the chroot.
-    source_resolv = "/etc/resolv.conf"
-    target_resolv = os.path.join(root_mount_point, "etc/resolv.conf")
+    source_resolv, target_resolv = path_pair(root_mount_point, "etc/resolv.conf")
     if source_resolv != target_resolv and os.path.exists(source_resolv):
         try:
             os.remove(target_resolv)